The IMTUF 100 - Idaho Mountain Trail Ultra Festival, held on September 19, 2026, in the stunning Salmon River Mountains near McCall, ID, is renowned as a post-doctoral level challenge for even the most seasoned ultrarunners. This "TUF" event offers both a demanding 100-mile and a stout 20-mile race, with typical race day conditions seeing highs around 70F and lows of 38F, and only a 6% chance of precipitation. The 100-mile course, a single loop, promises over 22,000 feet of breathtakingly scenic, yet relentlessly difficult, elevation gain and descent, often compared to the Wasatch 100 but with even more technical terrain. Runners will navigate very steep climbs and descents on rough, rooted, and rocky trails, including sections requiring boulder scrambling, all while traversing eight high mountain passes.

The course is a true immersion in Idaho's wild beauty, showcasing abundant glistening white granite, deep canyons with pristine rivers, and vibrant autumn colors. Participants should prepare for encounters with local wildlife, as the race often coincides with the peak elk rut, with bugling bulls frequently heard and seen, alongside bears, wolves, moose, and eagles. Aid stations, while well-supported with standard ultra fare like quesadillas and ramen, are strategically placed, with some significant distances between them, emphasizing the race's remote and committing feel. Uniquely, one aid station is famously packed in by goats, offering a simpler menu but an unforgettable experience and often a hot grilled peanut butter sandwich.

Starting and finishing at Jug Mountain Ranch, IMTUF 100 is not just a race; it's a profound mountain adventure. Its reputation as a Hardrock 100 and Western States 100 qualifier underscores its difficulty and prestige. Finishers are awarded classic belt buckles and even homemade soup from the Race Director's mother, adding to the refreshingly old-school, passionate vibe of this world-class event. IMTUF 100 demands respect, meticulous preparation, and a relentless spirit, promising a truly life-changing accomplishment for those who conquer its challenging trails.